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@ 2019-03-23T16:45:08Z

<?php
$collections = [
            0 => [
                0 => [
                    "attr_id" => 23,
                    "value" => "Single Side"
                ],
                1 => [
                    "attr_id" => 23,
                    "value" => "Double Side"
                ],
            ],
            1 => [
                0 => [
                    "attr_id" => 31,
                    "value" => "A4"
                ],
                1 => [
                    "attr_id" => 31,
                    "value" => "12x18"
                ],
                2 => [
                    "attr_id" => 31,
                    "value" => "B5"
                ],
                3 => [
                    "attr_id" => 31,
                    "value" => "A5"
                ]
            ]
        ];
$expected = [];        
foreach($collections as $k=>$v){
            foreach($v as $k1=>$v1){
                $expected[$v1['attr_id']][] = $v1['value'];
            }
        }
print_r($expected)        
?>

This is an error 500

Value for `_results` contains invalid data `array`

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